refactor: Move Astro to root, use PORT env (default 80), allow all hosts

- Move Astro files from dealplustech-astro/ to project root
- Update Dockerfile: PORT environment variable (default 80)
- Add vite.config.ts with allowedHosts: true
- Matches nixpacks behavior for Easypanel deployment
- No hardcoded ports or domains

node_modules/astro/dist/cli/docs/infra/process-cloud-ide-provider.js

@@ -0,0 +1,6 @@
+class ProcessCloudIdeProvider {
+  name = Boolean(process.env.GITPOD_REPO_ROOT) ? "gitpod" : null;
+}
+export {
+  ProcessCloudIdeProvider
+};